煤在纳秒级钕激光一、二次谐波脉冲下的热解研究

IF 0.7 4区 物理与天体物理 Q4 PHYSICS, MULTIDISCIPLINARY
B. P. Aduev, V. D. Volkov, A. Yu. Mitrofanov
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引用次数: 0

摘要

本文报道了一阶(λ1 = 1064 nm, τ1 = 12 ns)和二阶(λ2 = 532 nm, τ2 = 10 ns)重复脉冲钕激光辐射对褐煤(2B)、气煤(G)和脂肪煤(Zh)片状微粒的影响的比较研究。在二次谐波辐射下,相同能量密度的激光脉冲照射硬煤微粒形成的合成气分子浓度更高。煤微粒在相同强度的一次谐波脉冲和二次谐波脉冲作用下形成的合成气分子浓度相同。基于煤样品光学击穿过程中热化学反应初级中心的非线性产生和激光诱导等离子体的产生,提出了一个模型来解释合成气产率与激光脉冲强度的非线性依赖关系。在辐射能量密度相同的情况下,二次谐波激光脉冲照射煤微颗粒片样时激光诱导等离子体发光的光谱强度高于一次谐波激光脉冲照射时的光谱强度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Pyrolysis of Coals Exposed to Nanosecond First- and Second-Harmonic Pulses from a Neodymium Laser

Pyrolysis of Coals Exposed to Nanosecond First- and Second-Harmonic Pulses from a Neodymium Laser

Pyrolysis of Coals Exposed to Nanosecond First- and Second-Harmonic Pulses from a Neodymium Laser

We report a comparative study of the impact of repetitively pulsed neodymium laser radiation of the first (λ1 = 1064 nm, τ1 = 12 ns) and second (λ2 = 532 nm, τ2 = 10 ns) harmonics on tableted microparticles of brown (2B), gas (G), and fat (Zh) coals. The concentration of synthesis gas molecules formed when microparticles of hard coals are exposed to laser pulses of the same energy density is higher in the case of the second-harmonic radiation. The concentration of synthesis gas molecules formed when microparticles of coals are exposed to first- and second-harmonic pulses of the same intensity is the same. A model is proposed to explain the nonlinear dependence of the synthesis gas yield on the intensity of laser pulses, based on the nonlinear generation of primary centers of thermochemical reactions formed during optical breakdown of coal samples and generation of laser-induced plasma. The spectral intensity of the laser-induced plasma glow when tableted samples of coal microparticles are irradiated by the second-harmonic laser pulses is higher than that during irradiation by the first-harmonic pulses, with radiation energy densities being the same.

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来源期刊
Bulletin of the Lebedev Physics Institute
Bulletin of the Lebedev Physics Institute PHYSICS, MULTIDISCIPLINARY-
CiteScore
0.70
自引率
25.00%
发文量
41
审稿时长
6-12 weeks
期刊介绍: Bulletin of the Lebedev Physics Institute is an international peer reviewed journal that publishes results of new original experimental and theoretical studies on all topics of physics: theoretical physics; atomic and molecular physics; nuclear physics; optics; lasers; condensed matter; physics of solids; biophysics, and others.
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